Steam-boiler.



J. A. MUMPORD.

PATENTBD MAR. Y, 1904.

STEAM BOILER. APBLIUATION FILED un. 9. 190s.

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'PATENTED MAR. 8

J. A. MUMFORD. STEAM BOIL-ER.

APPLIUATION FILED APR. 9, 1903.

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" UNITED STATES Patented March 8, 1904:y

PATENT OFFICE.

JosEPH A. MUMEQRD, or Eo'sLYN, NEW YORK,

SPECIFICATION forming part of Letters Patent No.` 753,902, dated March8, 1904.

Application ledApi-il 9, 1903. Serial No. 151,768. (N o model.)

T0 all whom it may concern:

Be it known that I, JosurH A. MUMFORD, a citizen of the Dominion ofCanada, and a resident of the village of Roslyn, county of Nassau, Stateof New York, have invented certain` new and useful Improvements inSteam-Boilers, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, in which-Figure l illustrates a longitudinall` vertical sectional view of oneform of the invention. Fig. 2 illustrates a rear elevation of theinvention shown in Fig. 1. Fig. 3 illustrates a longitudinal verticalsectional view of a modified construction of the invention. Fig. 4illustrates afront elevation, theparts being broken away, of that whichis shown in Fig. 3.

This invention is an improvement upon that patented to me in and byUnited States Let# ters Patent No. 588,698, dated April 2l, 1896;

and it has for its object the adaptation of myv previously-patentedboiler to use in relatively contracted spaces-as, for instance, onvessels and in other places where space is limited.

The special features,"therefore, of this present invention are asfollows: The internal fire-A pot and continuous circulation of water ofmy said patented invention are retained herein; but instead of havingthe hre-tubes located solely in a rearwardly-extending part or sectionof the boiler proper with a hot water and steam drum above the boilerandwith waterlegs connecting theends of the drum and boiler, through whichthe water circulation may be had, in this present construction I removethe major part of the lire-tubes from the boiler proper and locate themin the drum, so that the space required bythe extended part of my formerboiler, inY which the fire-tubes werev Wholly located, is mostly saved,and under this present invention also the hotV gases or products ofcombustion `may be made to pass through a casing "on theirway to thestack,

thus coming in contact with the exterior of the boiler and of the drum,as well as passing through the fire-tubes, or they may be confined tothe lire-tubes alone, as shown and described in the accompanyingdrawings.

Referring now to the drawings, Figs. 1 and the furnace; C', the shortsections of lire-tubes within the boiler; D, the metallic flue whichextends clear acrossthe rear end of the boiler; E, a manhole; F, thevsuperposed water and steam drum; G, the fire-tubes in the drum; H, thestack; I and I', the water-legs connecting the boiler and the drum. J isthe shell or casing, which extends throughout the rear ends of theboiler and drum, respectively, separated somewhat from the flue D,whereby a water-jacket K is afford ed. In this construction it willbe'seen that an exceedingly compact and effective boiler is provided.The lower member or boiler proper is practically all devoted yto thefurnace or fire-pot section; yet without increasing its length beyondthe desirto contain short sections of fire-tubes by means of which themost excessive heat of the fire is immediately and most eifectively'usedfor genable length the water and steam drum is made erating the steam.The hre-flue D is surrounded with a water-jacket and connects with thefire-tubes G, which pass through the water and steam drum and connectwith the stack at their forward ends. The water circulation ismaintained through the water-legs I and I and also through thewater-jacket K, as well understood. v

Referring now to Figs. 3 and 4, the same general construction ispresent, modified in `certaindetails, as follows: The boiler-shellproper Vis indicated by A, the corrugated 1iningfor the furnace-pot B,the furnace C, the water and Steam drum F, and the stack I-I, as before;but inV this present construction in- .stead of there being thewater-jacketed metallic ue D the flue is a dry flue L, which may be madeof brick, supported upon any vsuitable foundation M.' N represents theshort sections of reftubes locatedin the.' end of the boiler, and they'are preferably'made relatively small in size and many in number,

as compared with theiire-tubes O' in the drum.

In this construction the products of combustion pass from the furnace tothe stack substantially as before-Ji. e., rst through the tubes in theboiler, then upwardly through the fiue L, and then forwardly to thestack through the tubes in the water and steam drum; but sometimes Iprefer to so construct the dry flue L that there shall be no partitionor closure between it and the space between the drum and the boiler, andI then provide side casings or plates P P, which preferably will extendfrom about the point of greatest horizontal diameter of the drum toabout the point of greatest diameter of the boiler, being securelybolted to both. In this modified construction the products of combustionafter passing through the lower lire-tubes N and into the dry flue Lwill pass thence to the Stack H,partly through the irregularly-shapedspace between the drum and the boiler, being confined by the sidecasings or plates P P, in their transit coming in contact with thewater-legs I and I' and also with the exterior surfaces of the boilerand the drum, and a portion of them will pass through the liretubes inthe drum, and in order that a considerable portion, at least, of theproducts of combustion may pass through these tubes, and thus act morebeneiicially as heating agencies, I enlarge these tubes quite decidedlyas compared with the tubes N in the boiler, as clearly illustrated inFig. 3.

It will be seen that the essential characteristics of the invention arepresent in both forms of boiler-that is to say, that the length of thestructure as a whole is reduced by shortening the iire-tubes in theboiler proper, thus greatly reducing its length, compensating for thisby locating other lire-tubes in the water and steam drum; yet theefficiency is as great if not superior to my former construction.

It will be obvious to those who are familiar with this art thatmodifications may be made in the details of construction withoutdeparting from the essentials of the inventionas, for example,.thecombination of a considerable number of relatively small and relativelyshort tire-tubes in the boilensection with longer and larger tubes inthe drum-section may be employed whether the products of combustion ontheir way to the stack pass in contact with the exterior shells of thesetwo parts or not; also, that a dry flue may be constructed of metalinstead of brick. Indeed,

the illustrations and description presented are suggestions merely of avariety of ways in which the essence of the invention may be employed.

I claim- 1. In an internally-fired boiler provided with means forcontinuous water circulation, the combination of a furnace locatedwithin the boiler, a water-space surrounding the furnace, a superposedwater and steam drum, relatively short ire-tubes in the boiler, otherfiretubes in the drum, the tubes in the drum being larger than those inthe boiler, aiiue con necting the two series of tire-tubes, and a stackconnecting with the front end of the fire-tubes which are located in thedrum.

2. In an internally-ined boiler provided with means for continuous watercirculation, the combination of a furnace located within the boiler, awater-space surrounding the furnace, asuperposed water and steam drum,tiretubes in the boiler and in the drum, a casing or side platesinclosing the space between the boiler and the drum and a iue or conduitfor the products of combustion connecting the boiler-tubes with thetubes in the drum and with the space inclosed by said casing and a stackconnecting with said space and with the tubes in the drum.

3. In an internally-fired boiler provided with means for continuousWater circulation, the combination of a furnace located within theboiler, a water space or jacket surrounding the furnace, a superposedwater and steam drum, firetubes in said drum, a casing or side platesinclosing the space between the drum and the boiler, a lire-iiueconnecting the furnace with the space between the boiler and the drum,and also with the lire-tubes in the drum, and

a stack connecting directly with said space and said Ere-tubes.

4. In an internally-fired boiler provided with means for continuouswater circulation, the combination of a furnace located within theboiler, a water-space surrounding the furnace, a superposed water andsteam drum, lire-tubes in the boiler and in the drum, a easing or sideplates inclosing the space between the boiler and the drum, a lue orconduit for the products of combustionv connecting the boilertubes withthe tubes in the drum and with the space inclosed by said casing and astack connecting with said space and with the tubes in the drum, thetubes in the drum being larger than those in the boiler.

In testimony whereof I have signed my name to this speciiication in thepresence of two subscribing witnesses.

JOSEPH A. MUMFORD.

Witnesses:

PHILLrrs ABBOTT, FLORA M. DoNsBAcH.

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